Monkey Review looks at the Vantec Stealth VAN-470A... Damn sweet if you ask
me, check out what they say here.

Each PSU delivers power, some a little more efficiently than
others, but they all carry the same drawback: with the increase of power, you
guessed it, you generate more heat. So this, in itself creates a new problem.
Vantec has done a good job of remedying this issue by using 3, yes 3, double
bearing fans which can be adjusted via rear switch. You have the option of selecting
Slow, Medium, or Auto. The Auto
setting relies on an internal sensor to detect the temps, and adjust the fans
accordingly to meet these needs. Ive looked at PSUs with a similar
feature; Antecs True Power Line offers a similar feature but lacks the
switch, which I really like.